JP2008215258A - Intake device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake device for an internal combustion engine with an improved intake air flow. <P>SOLUTION: The intake device for the internal combustion engine is provided with; an intake passage 50 through which intake air introduced to a combustion chamber 40 of the internal combustion engine passes; an intake manifold 100 mounted in a cylinder head 30 and composing a part of an intake passage 50; an intake control valve 200 capable of reducing passage area of at least a part of the intake passage 50; a valve shaft 300 pivotally supporting one end part of the intake control valve 200 in such a manner that the same can freely rotate; and a guide rib 400 projecting toward one end part of the intake control valve 200 from the intake manifold 100 and reducing a clearance between one end part and a wall surface of the intake passage 50 in a side where the valve shaft 300 is provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an intake device for an internal combustion engine, and more particularly to an intake device for an internal combustion engine having an intake control valve.

  2. Description of the Related Art Conventionally, an intake device for an internal combustion engine that controls the intake flow by controlling the opening and closing of an intake control valve disposed in the intake passage and forms a swirl flow such as a tumble (vertical vortex) or swirl (lateral vortex) in a combustion chamber Known from. These swirling flows contribute to improving combustion efficiency and promoting stratified combustion in an internal combustion engine.

  For example, Japanese Utility Model Publication No. 7-25264 (Patent Document 1) is provided with an intake control valve in which a passage of an intake port is divided into a first and a second passage by a partition, and the second passage is closed or opened entirely. An engine intake system is described.

Japanese Patent Laying-Open No. 2003-206761 (Patent Document 2) describes an intake air flow variable air supply device in which an intake control valve is provided for each cylinder of an in-line 4-cylinder internal combustion engine.
Japanese Utility Model Publication No. 7-25264 JP 2003-206761 A

  In the intake apparatus as described above, a gap between a support portion (referred to as “one end portion” in the present specification) by a valve shaft of a cantilevered intake control valve and a wall surface of an intake passage on a side where the valve shaft is provided. When the flowing airflow is generated, the airflow for generating the swirling flow (referred to as “main flow” in the present specification) may be affected. As a result, improvement in combustion efficiency and promotion of stratified combustion in the internal combustion engine are hindered.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an intake device for an internal combustion engine with an improved intake flow.

  An intake device for an internal combustion engine according to the present invention is an intake device for an internal combustion engine that introduces intake air into a combustion chamber of the internal combustion engine, and is an intake passage that allows intake air to pass therethrough; An intake manifold that constitutes a portion, an intake control valve that can reduce the cross-sectional area of at least a portion of the intake passage, a valve shaft that rotatably supports one end of the intake control valve, and an intake control valve And a gap suppressing portion that projects toward one end of the intake control valve from other parts and reduces the gap between the one end and the wall surface of the intake passage on the side where the valve shaft is provided.

  According to the above configuration, since the gap between the one end portion of the intake control valve and the wall surface of the intake passage can be reduced by the gap suppressing portion, the flow through the gap is suppressed, the intake flow is improved, and the combustion characteristics are improved. Can be improved.

  The other parts may be included in the intake manifold, or may be a fitting member that is fitted into the intake manifold and constitutes a part of the intake passage.

  In the above-described intake device for an internal combustion engine, preferably, the gap suppressing portion projects along the extending direction of the intake passage and defines a part of the intake passage.

  According to the said structure, the influence on the flow of intake air by providing a clearance gap suppression part can be made small because a clearance gap suppression part protrudes along the extension direction of an intake passage. As a result, the intake flow can be improved and the combustion characteristics can be improved.

  In the intake device of the internal combustion engine, preferably, the intake control valve has a second end portion located on the opposite side of the first end portion, and the gap suppressing portion is formed at a position closer to the first end portion than the second end portion. The

  According to the above configuration, the clearance between the one end portion of the intake control valve and the wall surface of the intake passage is reduced while suppressing the increase in the clearance suppression portion by providing the clearance suppression portion in the vicinity of one end portion of the intake control valve. can do.

  In the control apparatus for an internal combustion engine, preferably, the clearance suppression unit reduces the clearance between one end of the intake control valve and the wall surface of the intake passage in the entire movable range of the intake control valve.

  According to the above configuration, the intake flow can be stably improved regardless of the open / close state of the intake control valve.

  In the control apparatus for an internal combustion engine, preferably, the intake control valve generates a tumble flow in the combustion chamber.

  According to the present invention, the intake flow of an internal combustion engine can be improved and the combustion characteristics can be improved.

  Embodiments of the present invention will be described below. Note that the same or corresponding portions are denoted by the same reference numerals, and the description thereof may not be repeated.

  Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In the following embodiments, each component is not necessarily essential for the present invention unless otherwise specified. In addition, when there are a plurality of embodiments below, it is planned from the beginning to appropriately combine the configurations of the embodiments unless otherwise specified.

  In the present specification, the “internal combustion engine” may be a gasoline engine or a diesel engine. Further, the injector provided in the internal combustion engine may be an injector that injects fuel into the intake passage, or an injector that injects fuel into the cylinder. Furthermore, both of these injectors may be provided.

  FIG. 1 is an overall configuration diagram showing an intake device for an internal combustion engine according to an embodiment of the present invention. Referring to FIG. 1, a cylindrical cylinder 20 is formed in a cylinder block 10, and a pent roof type combustion chamber 40 is provided in a cylinder head 30 that covers the top of the cylinder 20. An intake passage 50 and an exhaust passage 60 are formed so as to be respectively connected to two inclined surfaces of the combustion chamber 40. The front end of the intake passage 50 is opened and closed by an intake valve 70, and the front end of the exhaust passage 60 is opened and closed by an exhaust valve 80. The intake passage 50 is bifurcated at the tip, and a pair of intake valves 70 provided for each cylinder open and close the tips. Similarly, a pair of exhaust valves 80 are provided for each cylinder. A plug 90 is disposed at the center of the combustion chamber 40 surrounded by these four valves. A piston 95 is disposed in the cylinder 20. In the example of FIG. 1, the top surface of the piston 95 has a flat shape, but the top surface is appropriately configured in a desired shape suitable for stratified combustion or the like.

  An intake device for an internal combustion engine according to the present embodiment will be described in detail with reference to FIGS. 2 and 3 in addition to FIG. 2 is a diagram showing intake manifold 100 and intake control valve 200 in the intake device for the internal combustion engine according to the present embodiment, and FIG. 3 is an enlarged view of the periphery of intake control valve 200. is there.

  As shown in FIGS. 1 to 3, an intake manifold 100 is connected to the cylinder head 30, and a cartridge 500 as an “insertion member” is inserted into the intake manifold 100. Intake air flows in the direction of the arrow DR1 in the intake passage 50 formed in the intake manifold 100, the cartridge 500, and the cylinder head 30. The intake control valve 200 adjusts the passage sectional area of the intake passage 50. As a result, a tumble flow in the direction of the arrow DR2 is formed in the cylinder 20. An intake control valve 200 and a valve shaft 300 are assembled to the cartridge 500. The valve shaft 300 rotatably supports one end portion (root portion) 210 of the intake control valve 200. As a result, the intake control valve 200 can rotate in the direction of the arrow DR3, and the intake cross-sectional area of the intake passage 50 can be adjusted by the intake control valve 200.

  The broken line in FIGS. 1 to 3 shows the intake control valve 200 with the intake passage 50 closed. In a state in which the intake passage 50 is closed by the intake control valve 200, the main flow (corresponding to the arrow F1 in FIG. 3) that passes through the gap between the other end (tip portion) 220 of the intake control valve 200 and the wall surface of the intake passage 50. ) To form a swirling flow (tumble flow) in the combustion chamber 40. Thereby, for example, mixing of fuel and air and propagation of flame can be promoted to improve combustion efficiency.

  As described above, when the swirl flow is formed by the intake control valve 200, the airflow (corresponding to the arrow F2 in FIG. 3) flowing through the gap between the one end portion 210 of the intake control valve 200 and the wall surface of the intake passage 50. If it is strong, the flow disturbs the main flow (F1), thereby inhibiting the homogenization of the intake air (air mixture). As a result, improvement in combustion characteristics of the internal combustion engine is hindered.

  The intake device for an internal combustion engine according to the present embodiment is provided with a guide rib 400 that protrudes from intake manifold 100 toward one end 210 of intake control valve 200 and reduces the gap between one end 210 and the wall surface of intake passage 50. ing. Since the guide rib 400 can reduce the gap between the one end portion 210 of the intake control valve 200 and the wall surface of the intake passage 50, the flow (F2) flowing through the gap can be suppressed. As a result, the combustion characteristics of the internal combustion engine can be improved.

  The guide rib 400 protrudes along the extending direction of the intake passage 50 (the direction of the arrow DR1) and defines a part of the intake passage 50. By doing in this way, the influence on the flow of intake air by providing the guide rib 400 can be made small.

  The guide rib 400 is formed at a position closer to the one end portion 210 than the other end portion 220 of the intake control valve 200. By doing so, the gap between the one end portion 210 of the intake control valve 200 and the wall surface of the intake passage 50 can be reduced while suppressing the guide rib 400 from becoming large.

  The guide rib 400 reduces the gap, regardless of whether the intake control valve 200 is in a fully closed state or a fully open state. That is, the guide rib 400 reduces the gap between the one end portion 210 of the intake control valve 200 and the wall surface of the intake passage 50 over the entire movable range of the intake control valve 200. The guide rib 400 is formed so as not to hinder the rotation of the intake control valve 200.

  The guide rib 400 is formed on an extension line of the wall surface of the intake passage 50 formed in the intake manifold 100. Further, the guide rib 400 is integrally formed with the members constituting the intake manifold 100. By doing in this way, the guide rib 400 can be formed at low cost.

  The above contents are summarized as follows. That is, the intake device for an internal combustion engine according to the present embodiment is attached to the intake passage 50 through which intake air introduced into the combustion chamber 40 of the internal combustion engine passes and the cylinder head 30 and constitutes a part of the intake passage 50. The intake manifold 100, the intake control valve 200 capable of reducing the cross-sectional area of at least a part of the intake passage 50, the valve shaft 300 that rotatably supports the one end portion 210 of the intake control valve 200, As a “gap suppression portion” that projects from the intake manifold 100 toward the one end portion 210 of the intake control valve 200 and reduces the gap between the one end portion 210 and the wall surface of the intake passage 50 on the side where the valve shaft 300 is provided. Guide rib 400 is provided.

  In the present embodiment, the example in which the guide rib 400 is formed as a part of the intake manifold 100 has been described. However, the guide rib 400 as the “gap suppressing portion” may be configured as a part of the cartridge 500.

  Although the embodiment of the present invention has been described above, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 is an overall configuration diagram showing an intake device for an internal combustion engine according to one embodiment of the present invention. FIG. 2 is a view showing an intake manifold and an intake control valve in the intake device of the internal combustion engine shown in FIG. 1. FIG. 2 is an enlarged view showing a periphery of an intake control valve in the intake device of the internal combustion engine shown in FIG. 1.

Explanation of symbols

  10 cylinder block, 20 cylinder, 30 cylinder head, 40 combustion chamber, 50 intake passage, 60 exhaust passage, 70 intake valve, 80 exhaust valve, 90 plug, 95 piston, 100 intake manifold, 200 intake control valve, 210 one end, 220 other end, 300 valve stem, 400 guide rib, 500 cartridge.

Claims (7)

An intake device for an internal combustion engine for introducing intake air into a combustion chamber of the internal combustion engine,
An intake passage for passing the intake air;
An intake manifold attached to the internal combustion engine and constituting a part of the intake passage;
An intake control valve capable of reducing a passage cross-sectional area of at least a part of the intake passage;
A valve shaft that rotatably supports one end of the intake control valve;
A gap suppressing portion that projects from another part different from the intake control valve toward the one end of the intake control valve and reduces a gap between the one end and the wall surface of the intake passage on the side where the valve shaft is provided. And an intake device for an internal combustion engine.   The intake device for an internal combustion engine according to claim 1, wherein the other component is included in the intake manifold. A fitting member fitted into the intake manifold and constituting a part of the intake passage;
The intake device for an internal combustion engine according to claim 1, wherein the other component is the fitting member.   The intake device for an internal combustion engine according to any one of claims 1 to 3, wherein the gap suppressing portion projects along an extending direction of the intake passage and defines a part of the intake passage. The intake control valve has a second end located on the opposite side of the first end;
5. The intake device for an internal combustion engine according to claim 1, wherein the gap suppressing portion is formed at a position closer to the one end portion than the other end portion.   6. The gap according to claim 1, wherein the gap suppressing portion reduces a gap between one end of the intake control valve and a wall surface of the intake passage over the entire movable range of the intake control valve. An intake device for an internal combustion engine.   The intake device for an internal combustion engine according to any one of claims 1 to 6, wherein the intake control valve generates a tumble flow in the combustion chamber.

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